A method of automatically switching in an on-hook state suitable for a telephone system is provided. The method automatically switches a spring circuit from an off-hook state to the on-hook state when the telephone system operates in an abnormal use state for a unreasonably long period of time. Therefore, the telephone system can be switched back to the on-hook state when the mouthpiece is unintentionally off the hook so the missing of the phone call can be effectively avoided.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A automatic on-hook telephone system, comprising: a telephone, having a spring circuit; an audio monitor, coupled to said telephone, for monitoring said telephone system to determine whether said telephone system is operating in a normal use state; a timer, coupled to said telephone, for counting a time of said telephone operating in an abnormal use state and generating a control signal when said time is longer than a predetermined time; and an electronic switch, coupled to said telephone, for switching said spring circuit to said on-hook state in response to said control signal.
2. The automatic on-hook telephone system of claim 1 , wherein audio monitor samples an audio signal for monitoring said telephone system to determine whether said telephone system is operating in said normal use state.
3. A automatic on-hook telephone system, comprising: a telephone, having a spring circuit; an audio monitor, coupled to said telephone, for monitoring said telephone system to determine whether said telephone system is operating in a normal use state; and an electronic switch, coupled to said telephone, for switching said spring circuit to an on-hook state when said telephone system is operating in an abnormal use state.
4. The automatic on-hook telephone system of claim 3 , wherein said audio monitor samples an audio signal for monitoring said telephone system to determine whether said telephone system is operating in said normal use state.
5. The automatic on-hook telephone system of claim 3 , further comprising: a timer, coupled to said telephone, for counting a time of said telephone system operating in said abnormal use state and generating a control signal when said time is longer than a predetermined time, wherein said electronic switch switches said spring circuit to said on-hook state in response to said control signal.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 25, 2004
March 21, 2006
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